单端正激变换器的本安特性研究-电力电子与电力传动专业论文.docx

摘 要 应用于煤矿井下的供电设备必须满足本安防爆的要求。单端正激变换器具有外围电路 简单，效率高、抗过载能力强、输入与输出隔离等优点，非常适于煤矿井下的危险性环境。 因此，对单端正激变换器的非爆炸本安特性研究具有重要的理论意义和实际使用价值。 首先，在研究单端正激变换器的工作原理及能量传输模式的基础上，推导出单端正激 变换器输出纹波电压和峰值电感电流的计算公式，获得了电流断续和连续两种工作模式下 的输出纹波电压和峰值电感电流与负载电阻、输入电压、电感之间的变化规律；其次，在 分析单端正激变换器电感分断和输出短路放电特性的基础上，推导出整个动态范围内的最 大输出短路释放能量计算公式，得出了本质安全特性的判断方法；再次，提出输出本质安 全型单端正激变换器主电路和控制电路的设计方案，并进行了具体设计。最后，利用 Matlab 和 Saber 软件对上述研究成果进行了仿真，论证了理论分析的正确性和设计方法的可行性。 关键词：本安电源；单端正激变换器；输出本安特性；输出纹波电压；峰值电感电流 Abstract Electrical equipments used in coal mine must meet explosion-proof requirements. For the single-ended forward converter has many advantages such as simple peripheral circuits, high efficiency, large over-load capacity, isolated input and output and so on, it is very suitable to be applied in underground coal mine. Therefore, it is important to research on intrinsic safety characteristics of single-ended forward converter. Firstly, the working principle and energy transmission mode of single-end forward converter were studied. The formulas of output ripple voltage and peak inductance current were derived. Both in discontinuous and continuous mode, the variation laws between output ripple voltage and peak inductance current and load, input voltage and inductance were obtained. Secondly, the inductance breaking characteristics and output short-circuit discharging characteristics were analyzed. The formula of maximum output short-circuit energy among the entire dynamic range was derived. The intrinsic safety criterion was obtained. Thirdly, the design schemes both main circuit and control circuit of output intrinsic safety type single-end forward converter were proposed, and a design example was given. Lastly, the simulation calculations were carried out with Matlab software and Saber software respectively. The simulation results showed that the theoretical research achievements are correct and design schemes are feasible. Key Words：intrinsic safety power source；single-end forward converter；output intrinsic safety charact